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https://github.com/prathmesh-ka-github/learning-mongodb
Learning MongoDB. MongoDB is a source-available, cross-platform, document-oriented database program.
https://github.com/prathmesh-ka-github/learning-mongodb
database dbms mongodb mongodb-atlas mongodb-database nosql rdbms
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Learning MongoDB. MongoDB is a source-available, cross-platform, document-oriented database program.
- Host: GitHub
- URL: https://github.com/prathmesh-ka-github/learning-mongodb
- Owner: prathmesh-ka-github
- Created: 2024-03-11T14:08:31.000Z (10 months ago)
- Default Branch: main
- Last Pushed: 2024-03-11T16:15:49.000Z (10 months ago)
- Last Synced: 2024-03-12T16:15:21.300Z (10 months ago)
- Topics: database, dbms, mongodb, mongodb-atlas, mongodb-database, nosql, rdbms
- Homepage:
- Size: 196 KB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Learning MongoDB.
#### MongoDB is a source-available, cross-platform, document-oriented database program. Classified as a NoSQL database product, MongoDB utilizes JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and current versions are licensed under the Server Side Public License.
### Basic commands for MongoDB Shell.
1. To show Databases -
```
> show dbs
```
2. To use/connect to a Database OR to make new Databse -
```
> use database-name
```
3. To make new collection -
```
> db.createCollection("collection-name")
```
4. To drop a Database (you need to be in that database) -
```
> use school
> db.dropDatabase()
//deletes current database
```
5. Inserting document in a database. In MongoDB we save data by inserting documents in the collection. Same as key:value pairs in JSON -
```
> use school
//using database school.
> db.createCollection("students")
//creating new collection named students.
> db.students.insertOne({name:'Spongebob', age:30, gpa:3.2})
//inserting one document into the collection.
```
6. To show contents of a collection.
```
> db.students.find()
//multiple fiters
> db.students.find({gpa:4.0, fullTime:true})
```
7. Projection.
```
//syntax
> db.students.find({-filter-}, {-projection-})
//examples
> db.students.find({fullTime:true}, {name:true, _id:false})
> db.students.find({}, {name:true, gpa:true, _id:false})
```
8. Sorting and limiting.
```
//syntax
> db.-collectionName-.find().sort({-field- : -ascending(1) and decending(-1)-})
> db.-collectionName-.find().limit(-limitNumber-)
//examples
> db.students.find().sort({name:1})
//this will sort the outputs by name and ascending order
> db.students.find().limit(2)
//this will limit results to 2
//both sorting and limiting
> db.students.find().sort({gpa:1}).limit(5)
```
9. Update fields.
```
//update one
//syntax
> db.students.updateOne({-selection criteria-}, {$set:{-update field:value-}})
//examples
>db.students.updateOne({name:'Spongebob'}, {$set:{fullTime:true}})
//update many
//syntax
> db.students.updateMany({-selection criteria-}, {$set:{-update field:value-}})
//examples
//$exists checks if does the document has that field.
> db.students.updateMany({fullTime:{$exits:false}}, {$set:{fullTime:true}})
```